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NOS Harris IRFP9240s, Vgs matched quads and pairs [The Europe Group Buy]
NOS Harris IRFP9240s, Vgs matched quads and pairs [The Europe Group Buy]
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Old 29th November 2019, 06:50 PM   #51
Lazybutt is offline Lazybutt  France
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Join Date: Mar 2009
got it vasilis
replied
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Old 29th November 2019, 07:04 PM   #52
blek stena is online now blek stena  Croatia
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Join Date: Nov 2004
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PM sent to Lazybutt.

Regards,
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Old 30th November 2019, 04:19 AM   #53
Lazybutt is offline Lazybutt  France
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Join Date: Mar 2009
Quote:
Originally Posted by EUVL View Post
0.1C accurate enough?


The scientific explanation is simple.
You have demonstrated yourself that the device is sensitive to (substrate) temperature.
The substrate temperature for each device can be deduced from the case temperature (on the metal tag), the device dissipation, and the Rthjc.
The variable is Rthjc, which is NOT identical for each device, due to variation of silver epoxy thickness (+/-10%).
So two devices having the same case temperature does not mean they have the same substrate temperature.
I think you’re missing the (other) elephant in the room...

I suppose you’re not drilling through the case to measure substrate Temperature ? (I didn’t see the holes in the Semisouth from the other GB... )
So you are left with case temperature measurement which is as you said an approximation of substrate temperature... your 0.1 deg accuracy is meaningless in such conditions since there is so much variation (as you said) in epoxy thickness and Rthjc.
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Old 30th November 2019, 05:10 PM   #54
Lazybutt is offline Lazybutt  France
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Samoloko, your PM box is full.

I forgot to mention, if you need a 3rd Quad as previously requested, I have some more.
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Old 7th December 2019, 05:27 PM   #55
Lazybutt is offline Lazybutt  France
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2 Sextets available if anyone wants them
See price and process in the description
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Old 17th December 2019, 10:29 AM   #56
vasillis is online now vasillis  Greece
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Join Date: Nov 2012
Location: athens
Fred parcel arrive

BR
Vasilis
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